Twelve children play musical chairs. if there are three chairs, how many ways are there for three children to sit?
220
12! /6
1,320
660

If there are three chairs,  there are 1320 ways for three children to sit.

Step-by-step explanation:

Given : Twelve children play musical chairs.

To Find :  If there are three chairs, how many ways are there for three children to sit.

Solution :

To Find the number of ways we use permutation :

We are given that there are 12 children and three chairs .

So, to calculate no. of ways we will use the formula given above .

where n = 12

r = 3

Hence , If there are three chairs,  there are 1320 ways for three children to sit.

12r - 8 - 12

you have to combine like terms. below i have bolded the like terms:

12r - 8 - 12

together it combines to:

12r - 20

hope this !